% Number of people (decision-makers) in dataset 
NP=336;       

% Number of choice situations in dataset. This is the number faced by all the people combined.
NCS=1083; 

% Total number of alternatives faced by all people in all choice situations combined.
% This is the number of rows of data in XMAT below.
NROWS=3281; 

% Load and/or create XMAT, a matrix that contains the data.
%
% XMAT must contain one row of data for each alternative in each choice situation for each person.
% The rows are grouped by person, and by choice situations faced by each person.
% The number of rows in XMAT must be NROWS, specified above.
% The columns in XMAT are variable that describe the alternative.
% 
% The *first* column of XMAT identifies the person who faced this alternative. 
% The people must be numbered sequentially from 1 to NP, in ascending order.
% All alternatives for a given person must be grouped together.
% The *second* column of XMAT identifies the choice situation. The choice
% situations must be numbered sequentially from 1 to NCS.
% All alternatives for a given choice situation must be grouped together.
% The *third* column of XMAT identifies the chosen alternatives (1 for
% chosen, 0 for not). One and only one alternative must be chosen for each
% choice situation.
% The remaining columns of XMAT can be any variables.

XMAT=load('Data2012_af.csv'); 